A hydrophilic filtration membrane having high chemical resistance, high strength, high water permeability and high blocking performance, and being superior in fouling resistance is provided. A hydrophilic filtration membrane containing a hydrophilic polyethersulfone having a contact angle of 65 to 74 degree, a molecular weight of 10,000 to 100,000, and the number of hydroxy groups of 0.6 to 1.4 per 100 polymerization repeating units. The hydrophilic filtration membrane may additionally contain a polyvinylpyrrolidone having a molecular weight of 10,000 to 1,300,000.

Claims

13 · 2 independent · depth 3

13 granted claims

›1.independentA hydrophilic filtration membrane comprising a hydrophilic polyethersulfone having a contact angle of 65 to 74 degree, wherein the number of hydroxy g…+4

›6.independentA process for producing a hydrophilic filtration membrane, the process comprising allowing nonsolvent-induced phase separation to occur by charging a …+7

›7.↳ 6The process for producing a hydrophilic filtration membrane according to claim 6, wherein the membrane production bath solution contains water.d2

›8.↳ 6The process for producing a hydrophilic filtration membrane according to claim 6, wherein the hydrophilic filtration membrane is a flat membrane, and …d2+1

›10.↳ 6The process for producing a hydrophilic filtration membrane according to claim 6, wherein the hydrophilic filtration membrane is a hollow fiber membra…d2

›11.↳ 6The process for producing a hydrophilic filtration membrane according to claim 6, wherein the hydrophilic filtration membrane is a hollow fiber membra…d2+1

›13.↳ 6A hydrophilic filtration membrane obtained by the process for production according to claim 6, wherein the number of hydroxy groups in the hydrophilic…d2

Classifications

12 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B01D33/21
B01D39/14
B01D39/00
B29C47/00
B01D67/00

USPC · US Patent Classification

210/500.41264/176.14264/41210/500.23264/178.R264/48210/500.42

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this patent are not paired with the granted ones in what we hold.

File wrapper

Pendency

5.0 y

1,818 days filing → grant

Office actions

non-final + final

Responses

no RCE

Interviews

examiner interview summaries

Examiner

Ana Fortuna

art unit 1779 · TC 1700

Law firm

Law firm · Log in to unlock

Citations: 28 back · 0 forward

See the full prosecution history — every USPTO and applicant action on this file, in order.

Chain of title

⤢ drag to zoom

Titlehover for detail · click to open

See the full assignment history — every owner this patent has passed through, with recordation dates and reel/frame numbers.

Term & fees

See the term timeline — pendency span, in-force span, the maintenance fees paid and both computed expiry dates.

Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110108478 A1	12 May 2011

Validity challenges

See the validity challenges on record — reexaminations, IPRs and PGRs, with their institution decisions and outcomes.

Citations

See every patent this one cites and every patent that cites it back — publication, assignee, and how each one was found.